Floor chipping machine



Aug. 5, 1952 J. H. MEYER FLOOR CHIPPING MACHINE 2 SHEETS-SHEET 1 Filed April 9, 1949 f" ORNEY Aug. 5, 1952 J. H. MEYER FLOOR CHIPPING MACHINE 2 SHEETS-SHEET 2 Filed April 9, 1949 URNEY Patented Aug. 5, 1952 PATENT-TOFFEE 2,606,012 FLOOR onrrrmc MACHINE John Henry Meyer, Rutherford, ,N. J

' Application April 9. 1949, Serial No. 86,462:

My invention concerns a machine for chipping cement floors to prepare them for receiving a new cement surface. c

It is a wellknown fact that the removal of an old cement surface from an underlying material of aggregates is an operation requiring considerable time and patience' Heretofore many difliculties have been encountered in removing all of the old cement from the underlying material. If all'of the cement is not removed it is impossible to obtain a proper bonding of the new cement to the underlying aggregates, and as a consequence the newly surfaced fioor will not be satisfactory.

One of the objects of my invention is to simplify and speed the chipping operation while at the same time to insure complete removal of the oldcement so that a 100% bond may be obtained by the new cement against the roughened material of the floor. Inlcarrying out this object I provide a rotating series of chipping hammers mounted on acarriage which is moved over the floor. The hammers are arranged to strike the floor in rapid succession, one at a time, and at spaced points on the floor crosswise of the machine delivering downward blows against the cement surface. These downward intermittent and laterally distributed .blows break up the cement layer quickly, shattering it loose from the underlying aggregates down deep into the surface. The loosened particles and dust may then be removed as by brushing prior to applying the new cement. 3

Anotherobject is to provide a, chipping machine which may be easily moved and directed from place to place over the floor surface, and requiring a minimum of power to operate.

A furtheriobject is to provide the hammers with striking heads which will automatically bring new strikingedges into action as the machine progresses with its work. For this purpose I employ hardened wheels which rotate freely on their pivots to bring new portions of their peripheral edges in position to strike the floor surface. I

A still further objectof the invention is to reducethe cost of constructing-a machine of this type by simplifying the parts and the assembling operations.

Various other objects and advantages will ap pear as the description proceeds.

. In the accompanying drawings: s

Fig. 1 is a plan view of the machine withparts broken away in section, the, mechanism being shown as it is in operation.

-; 1. teams. (c1.262-13) Fig. 2 is a detail of a center shaft.

Fig. 3 is a-detail of a rotatable sleeve.

Fig. 4 is a lengthwise section on the line 4-4 of Fig. l.- with a housing broken away and parts removed to show the hammers. I

I Fig. 5 is a diagram illustrating the angular position of the hammers as they strike the floor surface. a

Fig. 6 shows another drivingarrangement. In the drawings-the fnumeral l0 indicates a rotatableshaft or sleeve having ball races 1 l and I2 at opposite ends which are set into recessed. portions l3 and I4 of-the sleeve and mounted upon the reduced threaded ends 15 and I6 of a central fixed shaft l-l extending through the sleeve Ill. Locknuts Ha on the threaded ends 15 and I6 hold the ball races in place. The ends [5 and 16 of the shaft I! are bored and threaded at l8 to receive bolts l9 which pass through openings 20 in the side frames 2| and 2-2 of a movable carriage 23 which may beconstructed mounting plate 21 welded in place as indicated at 28 and 29. A section of 'lengthwisefra me 30 extending between cross frame 24 and cross frame 26 acts to further reinforce the framework of the carriage. The bolts l9 hold shaft I l fixed.

At the front 3| of the machine a pair of wheels 32 and 33 are rotatable in bearing brackets 3 secured beneath the respective side frames 2! and 22 by-bolts35 or other. appropriate fastenmgmeans; L A handlestructure Sit-having a cross bar 37, a rubber. or other covering-38, and a brace'39. are secured to the rearpart 4B of .the carriage'as by welding at 4| and 42. l 1

, Adjacent the rear of the machine there is also mounted a pair of wheels 43 and 441 These wheels have Iswivel mountings connecting the bearing brackets 45 to the attaching 'plates45 which in turn are secured beneath sides' ZI and 22 as by bolts 41. These front and back pairs of wheels provide steady, non-tilting mounting means for the superstructure of the carriage and enable it to be, easily moved and-directed over a floor surface 48 to be chipped, such as: one having a cement topping 49 and underlying aggregates or foundation 50. v

The rotatable sleeve l0 carries'a large pulley secured to the sleeve by a set screw 52, key, or other means, the pulley being shown in full lines in Fig. 1, but in dot-dash lines in Fig. 4 for clarity of illustration. The pulley 5! is driven in the direction of the arrow A by a belt or belts 53 from a small pulley 54 on the shaft 55 of a motor or engine 56. A suitable clutch 51 in the housing 51a of the engine is controlled by a lever 58 convenient to the operator of the machine, whereby power to rotate the sleeve Hi may be applied or released.

For breaking up the cement topping 49 there is carried upon the sleeve III a series of arms 60 spaced apart around the sleeve, in-the; present viding eight radial arms. The arms' may be in the form of units of two arms-eaoh.extending-;-

opposite directions from a central collar 60a secured to the sleeve ID as by a set screw 'Bilf Pivot pins 62 secure the hammers 63 swingably to the eight ends of the arms. The hammers carry at their freeends hardened chipping Wheels 84 which are pivoted for rotation on pins 65.

Upon rotation of the sleeve ID the arms 66 move the hammers 63 around clockwise as viewed in Fig. 4, and the wheels 64 strike thecement topping 48, one after another, in downward blows between the front wheels 32 and '33 of the carriage. In this connection it is to be noted in Fig. 5 that the angular-ity B between the arm 60 and the hammer 63'is very slight when the hammer is in the act of striking the floor-surface, the parts being arranged and proportioned so that two imaginary lines C, D, drawn .vertically throughthe axes of sleeve i0 and wheel 64 are substantially spaced from each other, placing the striking area well forward of the axis of the sleeve. These downward blows drive the chipping wheels swiftly and deeply into'the cement topping 49 and completely loosen it from the underlying foundation of aggregates.

The rotating parts are preferably encased in a housing having the rounded ends 66 and 61 secured to the cross frames 25,.and 26 by welding at 68. Side plates 69 and 10,- and the rounded dome H complete the housing which is open from end to end at the bottom and hasappropriate openings for the sleeve [0 as indicated at 12.

Each of the hammers 63 may be equipt with a lug 13 adapted to contact a stop pin 14 on the associated arm 60 to prevent the hammers at the front end of the machine from hanging downward on their pivots when the machine is stopped.

During the chipping operation the hammers swing outward by the forces of rotation, and, .as each hammer arrives at the location E on its downward drive at the front of the machine it has built up suflicient mass velocity to drive the chipping wheel well intothe surface of the floor, by reason of the downward striking action imparted to the blow. r Y

Preferably the chipping wheels 64' have a V-shaped profile providing. two chippingedges 16. This prevents rapid wear and gives better penetration.

In operation the sleeve [0 is put in rotation by applying power through the engine 56, and the carriage is then moved from place to'pl'ace over the floor surface until the process of chipping is completed, after which a new layer of cement is applied to the exposed aggregates. It has been found that a speed of rotation of 300 to 500 revolutions per minute is satisfactory for most purposes. This gives 2400 to four thousand blows 4 per minute to the chipping elements which operate to strike singly, one after another over a relatively wide pattern of floor surface between the ends of the rotating sleeve. The hammers usually are required to cut down into the surface of the floor to a depth of about one eighth of an inch which frees the cement, and cleans the surface of all foreign matter which would impair a bond of the new cement to the aggregates. It is-to be noted that the" hammers at the left of the machine are near the sid frame 22, making it possible to work close to the walls of the room at that side of the machine.

The mechanism of the machine does not involve expensive manufacturing operations. The

-'carriage consists mainly of ordinary channel irons welded together and reinforced by the transverse fixed shaft l1, while the rotating sleeve may be made of stock tubing internally machined at its opposite ends to provide recesses for the'ball races II and [2. The radial arms and the hammers may be produced in any appropriate way, as by casting or forging, and are easy to finish by ordinary machineshop methods. Any type of clutch or drive may be used.

. Preferably the housing is hinged as at 11, and curtains 18 are provided at the lower opening to prevent the flying of chips and dust.

In Fig. 6 a speed reducing arrangement employs a counter-shaft 18 having a pulley 80 driven'by a belt 8| from-the pulley 54. This in turn drives pulley 5| through belt 82, from the counter-shaft pulley 83, and may be used as a substitute for the other drive shown in Figs. land 4. r The striking order of the hammers may be arranged as desired. For instance in the present example they are positioned around the sleeve tostrike in the order 1, 4, 2, 3, and it has been found thatwith the parts proportioned substantially as shown the angle B is around 10 to 15 degrees which enables the hammers to deliver the'downward blowsrequired to work to the best advantagev against the floor surface. It is also to be noted that the rebound of the hammers after striking the floor carries them upward toward'the sleeve and that they pass around beneath the machine clear of the floor. It is seen in'Fig. 4 that the-arms 60 and the hammers 63 are of substantial length. This places the pivot 62 of the striking hammer near the floor and well forward of the axis of rotating sleeve [0. The chipping wheel 64 at the outer end of hammer number I is consequently considerably forward of the sleeve when it strikes the floor surface. It has been given a whipping action which drives the wheel into the surface in the form of a blow delivered practically at a right angle to the plane of the floor. The machine therefor strikes a series of vertical'hammer blows in rapid succession as the sleeve rotates and whips the hammers, one after another, outward and downward at the forward end of the carriage.

Various modifications may be made within the scope of the appended claims.

I claim:

1. A floor chipping machine comprising a carriageincluding side frames, a shaft extending between the side frames and non-rotatively secured thereto by its opposite ends, a sleeve surrounding said shaft, bearin'gs between said sleeve and said shaft providing rotatable mountings for the sleeve. radial "armscarried by said sleeve, hammers pivoted to the ends of said arms, chipping means at the free ends of said hammers, and means for rotating said sleeve,

said hammers being mounted to deliver blows singly, one after another, against the floor, the hammers being located at spaced positions laterally along said sleeve, each hammer acting in turn to strike the floor at a point spaced from the striking points of the other hammers crosswise of the machine, whereby the chipping means breaks up the floor surface at spaced points across the floor while the machine is moved lengthwise along the floor to bring new areas beneath the hammers, said arms and said hammers being of substantial length, the pivot of each succeeding hammer being relatively near the floor surface and substantially forward of the axis of the sleeve when the hammer is delivering its blow, said chipping means when striking the floor surface being considerably forward of said pivot by reason of the substantial length of the hammer and the nearness of its pivot to the floor surface, each succeeding hammer being given a downward whipping swing around its pivot and driving said chipping means at practically right angles against the floor surface, said chipping means comprising wheels having hard- 6 ened cutting edges and rotatably mounted in the free ends of said hammers.

2. A floor chipping machine according to claim 1, provided with means adaptedto prevent said hammers from hanging downward on their pivots at the working end of the carriage when the machine is stopped. I

' JOHN HENRY MEYER.

REFERENCES QITED 

